Other mistake: After the concert, when Dewey is telling Gordon how awesome the lights were, Eleni calls him Jack. The actor that plays Dewey is Jack Black. (This mistake is mentioned in the Kids Kommentary [sic].) (01:35:40)
School of Rock (2003)
Plot summary
Directed by: Richard Linklater
Starring: Jack Black, Joan Cusack, Mike White, Adam Pascal
Dewey is going to be evicted from his apartment by his roommate (a substitute teacher) if he doesn't come up with some money. He gets a call from a school principal and pretends to be his roommate and teaches the fifth grade kids how to play rock so he can win the Battle of the Bands and get $2000.
Keylime
More mistakes in School of Rock
Ms. Mullins: I've just been informed that all of your children are missing.
Trivia: The final sequence during the credits was all unscripted. Both the dialog and music solos were improvised.
More questions & answers from School of Rock
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Answer: It is never said but If I was to guess, they got it from the guy he was pretending to be (Ned's) information from the school office.